SBMCC: A Generic Source-based Congestion Control Algorithm for Reliable Multicast

This paper presents a simple, generic source-based end-to-end multicast congestion control (SBMCC) algorithm for reliable multicast transport (RMT) protocols. The algorithm is completely implemented at the source and leverages the reverse control information flow in RMT protocols like PGM or RMTP [13, 43]. Specifically, it does not introduce any new control traffic or new fields in RMT protocol headers. It addresses the drop-to-zero problem [42] by introducing a robust, adaptive time-filter based upon RTT estimates collected by observing NAK traffic. This solution allows it to scale for large multicast groups while being very adaptive to congestion situation changes in any part of the tree. The algorithm is provably friendly to TCP, and competes fairly with TCP for bandwidth. The scheme has minimal control traffic requirements and weak RTT estimation requirements which allows a large deployment space including multi-sender multicast. 1 Introduction Multicast is slowly moving from exp..